Method and apparatus for encoding and decoding key data

a key data and key data technology, applied in the field of key data encoding and decoding methods, can solve the problems of ineffectiveness, reduced reliability of data, and serious computational costs and efficiency, and achieve the effects of reducing the range of key data, and increasing the compression rate an entropy encoder
US20060171533A1Inactive Publication Date: 2006-08-03SAMSUNG ELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
SAMSUNG ELECTRONICS CO LTD
Publication Date
2006-08-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

An apparatus and a method for encoding and decoding key data are provided. An apparatus for encoding DPCMed differential data of key data includes a DND operator which performs on input differential data a predetermined number of times a DND operation, in which a divide operation is performed on the input differential data so as to divide differential data belonging to a positive number region into halves and so as to convert one half of the differential data belonging to an upper range than the other half into negative values, and either a divide-up operation or a divide-down operation is selectively performed on the results of the divide operation depending on the range of the results of the divide operation so as to reduce the range of differential data belonging to a negative number region or the positive number region, respectively, a shift-up operator which performs a shift-up operation on the results of the DND operation so as to transfer the differential data having been through the DND operation to either the positive or negative number region, a differential data selector which selectively outputs either the differential data having been through the DND operation or the differential data having been through the shift-up operation, and an entropy encoder which entropy-encodes the differential data selected by the differential data selector.
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Description

[0001] This application claims the priority of Korean Patent Application No. 2002-64007, filed Oct. 19, 2002, in the Korean Intellectual Property Office. This application also claims the benefit of U.S. Provisional Application No. 60 / 333,130, filed Nov. 27, 2001; U.S. Provisional Application No. 60 / 334,541, filed Dec. 3, 2001; U.S. Provisional Application No. 60 / 342,101, filed Dec. 26, 2001; and U.S. Provisional Application No. 60 / 369,597, filed Apr. 4, 2002. The entire contents of these applications are incorporated herein by reference.BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to a method and an apparatus for encoding and decoding key data, and more particularly, to an apparatus and a method for encoding key data which are capable of increasing the efficiency of encoding key data by generating differential data performing differential pulse code modulation (DPCM) on key data and by decreasing the range of the differential data...

Claims

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